[error] 30445#30445: *35301 FastCGI sent in stderr: "PHP message: PIWIK_DOCUMENT_ROOT is: /var/www/html/wp-content/plugins/matomo/app" while reading response header from upstream
By the way the bug is not permanent, today the email came with the correct paths. I looked at the history of e-mails and noticed that every 2-3 e-mails with wrong paths.